Search for Charged Lepton Flavor Violation in Narrow Gamma Decays
Author(s)
Dujmic, Denis; Henderson, Shawn Wesley; Sciolla, Gabriella; Yamamoto, R. K.; Zhao, M.; Cowan, Ray F; Fisher, Peter H; Spitznagel, Michael A; ... Show more Show less
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Charged-lepton flavor-violating processes are unobservable in the standard model, but they are predicted to be enhanced in several extensions to the standard model, including supersymmetry and models with leptoquarks or compositeness. We present a search for such processes in a sample of 99×10[superscript 6]Υ(2S) decays and 117×10[superscript 6]Υ(3S) decays collected with the BABAR detector. We place upper limits on the branching fractions B(Υ(nS)→e[superscript ±]τ[superscript ∓]) and B(Υ(nS)→μ[superscript ±]τ[superscript ∓]) (n=2,3) at the 10[superscript -6] level and use these results to place lower limits of order 1 TeV on the mass scale of charged-lepton flavor-violating effective operators.
Date issued
2010-04Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
Physical Review Letters
Publisher
American Physical Society
Citation
BABAR Collaboration et al. “Search for Charged Lepton Flavor Violation in Narrow Upsilon Decays.” Physical Review Letters 104.15 (2010): 151802. © 2010 The American Physical Society
Version: Final published version
ISSN
0031-9007